Two officers were placed on paid leave after one of them fatally shot 24-year-old Manuel Diaz Saturday after chasing him and two others out of an alley, Anaheim Police Chief John Welter reportedly said.

Crystal Ventura, a 17-year-old who witnessed the shooting, told the Register that the man had his back to the officer. Ventura said the man was shot in the buttocks area. The man then went down on his knees, she said, adding that he was struck by another bullet in the head. Ventura said another officer handcuffed the man, who by then was on the ground and not moving.

About 200 people gathered around the scene of the shooting to protest police brutality, reportedly pelting cops with bottles and rocks at officers who were securing the scene for investigators to collect evidence. Anaheim police Sgt. Bob Dunn told CBS that the crowd advanced on police so they fired bean bags and pepper balls at them.

Tensions continued through Sunday as a group of protesters - chanting "no justice, no peace" - stormed the lobby of the Anaheim police station, the AP reported.

Four people told Jay Jackson, reporting for CBS2 and KCAL9, that police offered to buy their cell phone video of Saturday's event.